Effect of Temperature and Cathodic Disbondment on the Performance of FBE and Hybrid Epoxy Coatings in Sabkha Soil and Persian Gulf Environments

Document Type : Original Article

Authors

Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran.

Abstract

Fusion-bonded epoxy (FBE) and a commercial hybrid epoxy were evaluated for their barrier performance and damage tolerance in simulated Sabkha soil and Persian Gulf seawater environments at 23 and 36 °C. The study utilized electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and adhesion testing to quantify coating degradation in intact, scratched, and cathodic disbondment (CD) scenarios. Results indicated a distinct performance trade-off: intact FBE exhibited superior primary barrier properties, maintaining a higher low-frequency impedance modulus (>1010 Ω cm²) and lower capacitance than the hybrid system, which is attributed to its tighter microstructure. However, under damaged conditions coupled with cathodic protection, the hybrid epoxy demonstrated superior defect tolerance. While the FBE coating showed increased susceptibility to oxide lift and alkaline-induced delamination, particularly in Persian Gulf seawater at 36 °C, the hybrid system effectively resisted interfacial degradation, maintaining a NACE rating of 2 in the same aggressive environment. Mechanical testing confirmed that both systems possessed excellent initial adhesion with pull-off strengths consistently exceeding 1000 psi and cohesive failure modes. The findings suggest that while FBE offers better initial isolation, the hybrid epoxy provides enhanced reliability in scenarios where mechanical damage and subsequent cathodic disbondment are the primary failure risks.

Keywords

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References

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Progress in Color, Colorants and Coatings
Volume 20, Issue 1 - Serial Number 64
February 2027
Pages 111-125

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